"Portability is the key, when you are a working musician. The flat frequency response of the S4 allows me to work everywhere. You have to use precise tools to get great results. The S4 is right on, what you hear is what you get."
OLLO vs. Sennheiser vs. Audeze vs. AKG vs. Beyerdynamics vs. Audio Technica
We measured and compare the frequency responses of the main mixing headphones on the market. Measurements were made using G.R.A.S 45CC using IEC 60318-1 ear simulator and Dewesoft AD conversion Sirius system.